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(No Model.) 4 sheets-sheet 1.

P. H. MOREL,

SLIDE VALVE. No. 524,180. Patented Aug. 1894.

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(No Model.) 4 `Sheeis--Sheet 3. F. H. MOREL.

SLIDE VALVE.

Patented Aug. 7, 1894.

y `o 0E plates.

i UNITED STATES PATENT OFFICE.

. FREDERICy HENRI MOREL, OF DUNKERQUE, FRANCE.

S LlDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 524,180, dated August'7, 1894. Application ledMay 27.1892. Serial No. 434,687. (No model.)Patented in France March 19, 1892, No. 220.281.

To all whom it may concern:

Be it known that I, FREDERIC HENRI Mo- REL, residing at Dunkerque, inthe Republic of France, have inventeda new and useful Im- 5 provement inSlide-Valves, (for which I have obtained a patentin France, dated March19,

1892, No. 220,281,) which is fully set forth in the followingspecification.

The distribution of steam by ordinary, or eccentrically operated slidevalves should in order to operate under favorable conditions, alwaysgive a certain lead, which is capable of adjustment or regulation. Theopenings for passage .ofsteam should be as wide open as possible, andthe pressure in the cylinder should vary as little as may be from thatof the generator.

In ordinary steam distribution by slidevalves, particularly known as theStephenson slide-Valves, inconveniences are encountered, when suchvalves are employed to produce a cuto with small introductions, andthese inconveniences are: First. The lead is variable increasing withthe cut-'0E in the case as a slide-valve having bars which are notcrossed, whereas in the cas'e of valves having crossbars, the leaddiminishes, and becomes m'l at the point of actual cut-oft'. Second. Thesteaminlet ports diminish' as the degree of lead decreases, and cut-oftincreases, resulting in a diminution of the pressure relatively to thatof the generator, which is detrimental in that it neutralizes theordinary advantages of the cut-oft.

The present invention has reference to distribution by ordinaryslide-valves, and is designed to overcome the inconveniences abovereferred to, by modifying the construction of the valve, and combiningtherewith two con- 4o trolling or cut-oft plates, which are stationaryduring the running of the engine, which can be adjusted eithersimultaneously or independently, and by hand or automatically while theengine is in operation.

- The invention can be more readily understood with reference to theaccompanying drawings, in which-- Figure 1, is a diagrammaticalsectional view 0f my improved slide-Valve showing the cut- Fig. 2, is afront elevation of a valve casing and supports showing mechanism bywhich the cut-oft plates may be adjusted.l Fig. 3, is a side elevationof Fig. 2. Fig. 4, is a longitudinal section through the slide valve andcasing on line c-d Fig. 5, and Fig. 5is a transverse section on line a-bFig. 4. Fig. 6, represents a View (similar to Fig. 3,) of a modifiedform in which the cut-olf plates are operated by independent levers.Fig. 7, represents a front elevation of another modified form ofadjusting mechanism for the cut-oft plates. Fig. 8, is a longitudinalcen,- tral section through the slide valve and casing of Fig. 7. Fig. 9,is a transverse section on line a-b Fig. 8, and Fig. 10, is a top planView of Fig. 7. Fig. 1,1, represents an outside screw for operating thecut-0E plates, which may be used instead of the levers, used inconnection with the mechanism shown in Figs. 2, 3, 4 and-5, andFigs.l2,l3 and 14 are views similar to Figs. 2, 3, and 5 respectively,showing connections wherebyl the cut-ott` plates are automaticallyadjusted. p

A represents the slide valve, which is adapted to act as do the ordinaryslide-Valves, but which is provided with inlet passages a and b, c and dtherethrough at opposite ends, said inlet passages uniting at theirinner ends forming single discharge openings m. The passages a and b areopened and closed by two adjustable plates p and q which engage againstthe back of the slide valve A. These plates are adjustable in oppositedirections to regulate the admission of steam and are provided withopenings e at about the middle thereof through which openings steampasses into the passages a, b, c and ol and thence to the-cy1inder.

The principle of the invention will be understood by reference to Fig.1.

The extremities or edges c, c of the valve act as do valves of ordinaryconstruction in determining the lead and varying the openings of theadmission ports N and R. As shown (in Fig. 1.) the piston is supposed tobe at its upper dead point and the slide-valve j A has opened the port Rto the extent indicated by the letter h, which constitutes the lead.

If we suppose the case of a slide-valve with crossed-bars, and that hindicates the maximum extent ot the lead, it will be seen that IOO theslide is more of its extremepositions. In

this position, plate p is so placed that the nears the mean position.

edges c f coincide exactly with the edges of the orifices a, b. As thepiston moves back the slide-valve moves in the direction of the arrow,and when the valve shall have moved a distance fr, the total opening ofthe port of admissionwill be equal to h plus 3X; that if we assume thatthe width of orifices a, b is at least equal to that the width of m isequal to 25, and that the orifice m has not been closed in part by theedge Z.

If the position of the valve be changed,the lead would be decreased. Letus suppose it be decreased one-half h. To obtain a constant lead or asit may be better expressed, to obtain a constant area of lead opening hit becomes necessary to give a lead of one-half h to the plate p; thatis to say one-fourth h upon each orifice a and h. I can obtain the sameresult by raising plate p a distance equal to one-half h plus one-fourthh equals three-fourths h.

When the slide shall have moved a distance x', the total opening of theport of inlet will be h plus 3X, that is, the lead or area of leadopening will be constant. `The other end of the slide valve will becontrolled in like manner-by the plate q. Vith this arrangement the leadremains constant while the sectional area of the steam passageis aboutthree times greater than that of ordinary valves.

My system is applicable to existing engines without increasing theheight of the valve casing, for the slides being moved by eccentricscapable of eecting expansion,whether in marine engines, or double ortriple expansion, or locomotives with two or four cylinders, are alwaysprovided with excess of room in the casing.

The degree of adjustment of the plates y, q depends on the lead given bythe ordinary valve in different positions of the eccentric.

On noting the operation of the ordinary Stephenson valve it. will beseen, first, for the same position of the slide, the leads at the portsN, R are nearly the same;v second, the variations of lead of the samefor successive positions of the slide in the forward movement, as wellas for corresponding positions of the backward movement; third, forequal and successive movements of the valve, the variations of leadbecome less as the valve These remarks apply to valves with or withoutcross-bars.

In the present invention, the adjustment of the plates may be effectedin two ways, rst, by mechanism independent of the engine and actuated byhand; or, second, by mechanism connected with and actuated by theengine. Each of these two modes of regulation may be carried out byvarious mechanisms.

In Figs. 2, 3, 4 and 5 I have shown an adjusing mechanism adapted to beoperated by hand and consisting of shafts 1 and 2 passing through andjournaled in the valve casing, and'carrying (inside of the casing)suitable shifting arms 3 and 4 which loosely engage transverse groovesin the plates p and q. The

shafts 1 and 2 are revolved by suitable levers 5, 6, and 7 and rod 8, inconnection with a hand-wheel 9, engaging a screw-thread at the lower endof rod 8. In Fig. 6, I substitute for the levers 5, 6 and 7 and rod 8two independent levers 10 and 11, so that the plates can beindependently adjusted.

Figs. 7, 8, 9 and 10 represent another modiiication of the adjustingmechanism consisting of a right and left hand screw-threaded shaft 12,which extends throughthe casing parallel with the slide-valve, thethre'ads engaging in suitable blocks 13 and 14, connected with therespective cutoff plates. This shaft 12 carries a worm-wheel outside ofthe casing which is operated to revolve the same by suitable connectionswith a hand-wheel 15. It is evident'that when the shaft is revolved thecut-0E plates p and q will be moved in opposite directions, through themedium of the right and left hand threads and the blocks 13 and 14.

In Fig. 11, a right and left hand screwthreaded shaft 30 engaginginblocks 31 and 32 pivoted to arms 33 and 34, which also carryindicating hands 17 and 18 is revolved by hand wheel 35. This form ofmechanism may be used to revolve the shafts 3 and 4 in place of levers5, 6 and 7 and rod 8 (as shown in Figs. 2, 3, 4, and 5), the handsserving to indicate the amount of adjustment of the plates, upon asuitable scale.

Instead of adjusting the cut-0E plates p and q by hand, as heretoforedescribed, I may accomplish `the desired result automatically by meansof suitableoonnection with the. engine, and preferably with thegovernor, so that when the speed reaches a certain predetermined limit,the cut off plates will be` operated to diminish the supply of steam inthe cylinder. Such mechanism is shown in Figs. 12, 13 and 14, in whichIshow an interior mechanism for operating the plates similar to thatshown in Figs. 4 and 5, the shafts 1 and 2 carrying at their outer endsthe lever 19 and bell-crank lever 20, respectively. The free end of thebell crank lever 20 is joined to lever 26 on shaft 24 by a connectingrod 25. The shaft 24 is operated by any suitable connection with theengine as mentioned above.

What I claim is- 1. The combination with a flat slide-valve, havingsteam passages at its opposite ends, of controlling plates arranged uponthe rear face of said valve, and also provided with steam passages, saidplates being stationary during the normal operation of the engine,

and means for adjusting said plates to different positions to regulatethe normal area of lead opening as may be required in the differentconditions of running, substantially as described.

IOO

IIO

2. The combination with a slide-valve havvalve, and regulating both ofsaid passages,

said plates being stationary during the normal running of the engine,and means for adj usting said plates to different positions, whereby aconstant area of lead opening during normal running is obtained with asteam inlet of large sectional area, substantially as described.

3. The combination with a slide-valve hav- 4. The combination with aslide-valve provided With steam passages, of controlling plates alsoprovided With steam passages, said plates being arranged on the surfaceof the valve and. being stationary during the nor-l mal running of theengine, and means actuated by a Working part of the engine for shiftingsaid plates automatically uponabnormal change of speed in the running ofthe engine, t0 regulate the area of lead opening substantially asdescribed.

In testimony whereof I have signed this specification in the presence oftWo subscrib- -ing Witnesses.

FREDERIC HENRI MOREL. Vitnesses:

DR. v. GREIsER, FLENN MERLEN.

